global

问题 A quick note at the very beginning to avoid false duplicates: There are tons of questions here about when static variables get cleared and how long they live. This is not what I'm asking about here. If I have a static variable in a program on a PC and I launch two different copies of the program, then each copy will usually run in its own sandbox with its own private values for its static variables. So, they are not system-wide global (not sure if that is good terminology here). Are there

问题 I know that global vars are a bad practice in javascript and in programming overall, but i want to make my user session available throughout my express.js app, avoiding having to pass the session parameter all over, from my controllers to my models. How can I best do this? Thanks! 回答1: I ended up solving this like so: var appendLocalsToUseInViews = function(req, res, next) { //append request and session to use directly in views and avoid passing around needless stuff res.locals.session = req

问题 This question already has answers here : Access overridden global variable inside a function (2 answers) Closed 3 years ago . How to access global variable from a function when the name is same as argument name in JavaScript ? var name = null; function func(name) { // How to set the global variable with the passed value } 回答1: If you are really talking about a global variable this can be done this way: function func(name) { window.name=name; } in a browser or function func(name) { global.name

问题 Just like the question said. Is possible to set global button(not in the class) to activate global method directly? I confused on setting target and action part. import "Global.h" void methodA() { UIButton *button = [UIButton buttonWithType:UIButtonTypeRoundRect]; button.frame = CGRectMake(0,441,100,30); [button addTarget:??? action@selector(methodB????) forControlEvent...]; } void methodB() { } //end of file 回答1: What you are trying to do is set up a nil-targeted action that works with the

问题 I have an issue and I'm trying to figure out the best/simplest way to resolve this... I have multiple users on my app. the app allows users to add books to a read-queue list (like a list of books a user can keep tabs on). Originally, I set the read-queue list as a global array. However this meant that multiple users were adding books to a single global array. If user1 added 3 books, user2 would also see those 3 books. Or if user1 cleared the read-queue list, user2's books were cleared too.

问题 I'm developing a program in C# and need a mutable variable that is available to all classes in my program. For example, I want to set it to a default value, say false , when the program starts, then be able to change it to true later when an action occurs. The true value then needs to be conveyed when other classes read it. How can this be achieved? 回答1: How about a static?: public static class MyProps { public static bool MyProp { get; set; } } In your code: MyProps.MyProp = true; No

问题 Hallo, I'm using CMake as build system in one of my projects which is quite complex. The project includes several libraries and several applications. My goal is, to make the following possible: Libraries may be built on request by user (realised by cached CMake variable) Applications are built on request by user (see above), but an application may select which libraries are required and build them without the user selecting them This should not change the cached user selection on which

问题 I'm developing an app for iPad that often needs to share variables. Too me it seems like the easiest solution would be to create a class with global variables instead of focusing on passing back and forth - as I've also had some problems with that. What's the easiest way to create and use global variables in objective-C for iPad IOS7 using Xcode 5 with storyboards? (I know there are duplicates but I can't make it work) 回答1: Edit: following @nhgrif and others comments, I am slightly changing

问题 I have a problem. Here's my code: public String getXmlFromUrl(String url) { String xml = null; new Thread(new Runnable() { @Override public void run() { try { // defaultHttpClient DefaultHttpClient httpClient = new DefaultHttpClient(); HttpGet httpGet = new HttpGet(url); HttpResponse httpResponse = httpClient.execute(httpGet); HttpEntity httpEntity = httpResponse.getEntity(); xml = EntityUtils.toString(httpEntity); } catch (UnsupportedEncodingException e) { e.printStackTrace(); } catch

问题 Closed . This question is opinion-based. It is not currently accepting answers. Want to improve this question? Update the question so it can be answered with facts and citations by editing this post. Closed 2 years ago . I've read C2Wiki on Global Variables, and I have three questions about them (at the bottom of this post). The main question is: If Global Variables are so bad, why does Ruby have them? Also, I've noticed some interesting behaviour regarding Global Variables in Ruby, that